The battery percentage moved to beside the battery symbol for better readability and VoLTE in Telenor Norway, Hutch (3), Danmard/Sweden and VoWiFi in Germany (Vodfone, O2 and Telekom) was added in some new operatore configuartions, as per Sony’s official changelog.

Xperia X Concept 38.3.1.A.0.91 firmware update

You can now activate battery percentage in the status bar (activate in SystemUI Tuner).